Added clamp in RageColor->RageVColor conversion to fix some artifacts

Fixed "autogen doesn't generate patterns for all difficulties for some songs"
Fixed incorrect "show" value in "show!hold" being written in DWIs
Fixed "song ends early after adding an edit then playing"

stepmania/src/RageDisplay.cpp

@@ -273,6 +273,14 @@ void RageDisplay::DrawQuads( const RageVertex v[], int iNumVerts )
 	ASSERT( (iNumVerts%4) == 0 );
 	g_vertMode = GL_QUADS;
 	AddVerts( v, iNumVerts );
+
+	glInterleavedArrays( GL_T2F_C4UB_V3F, sizeof(RageVertex), g_vertQueue );
+	glDrawArrays( g_vertMode, 0, g_iNumVerts );
+
+	g_iVertsRenderedSinceLastCheck += g_iNumVerts;
+	g_iNumVerts = 0;
+
+	g_iDrawsSinceLastCheck++;
 }
 void RageDisplay::DrawFan( const RageVertex v[], int iNumVerts )
 {